well each rifle IMHO has its own sweet spot. the powders i tend to use are 4064, varget, and AA2520. with a 200gr bullet, try varget say 44 gr and work up. my latest load is varget 46gr and a 200gr hollow point. i tend to go heavy on the bullet weight, for some reason that is the most consistent in all rifles. but i do load 125gr bullets for coyote. when i go ligher than say the 185gr bullets (i miss those 'bulk' bullets at 185gr, anyone know where to get em?) i find it harder to find a load thats consistent rifle to rifle, for example on 150gr bullet, one rifle will shoot 3 inch group with 45 gr varget,, but same load in another rifle is all over paper. also watch bullet shape and style. my gew98, only likes flat based bullets.
hornady has some 200gr hollow points,not to expensive, and thats what i use for target shooting.
also see 'yugo sniper' ammo. getting expensive, but its as good as 90% of my reloads.
also especally with rc, make sure you are seating the bullet correctly. those chambers are funky. i have a general 'seat' bullet i use, but when i load a k98 i take a cartrage and mark it, seat is way on out, chamber it, then measure where it hits the lands, go back say .05+ from there. be careful on that. seat it to far out and the pressure just jumps.